AutoCodes – GMC – P0698 2018 GMC Sierra

P0698 2018 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0698 2018 GMC Sierra indicates 5V Reference 3 Circuit Low Voltage.
Common causes: Common causes include Faulty Sensor on 5 Volt circuit, Sensor on 5 Volt circuit harness is open or shorted, Sensor on 5 Volt circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 254

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 17, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0698 2018 GMC Sierra Description

The Engine Control Module (ECM) has four (4) internal 5 Volt reference circuits (Some models have two (2) internal 5 Volt reference circuits). Each internal reference circuit provides external 5 Volt reference circuits for more than one sensor. A short to ground or short to voltage on one external 5 Volt reference circuit can affect all the components connected to the same internal 5 Volt reference circuit. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a lower than the expected voltage on any of the 5 Volt reference circuits for greater than 0.5 s.

OBDII Code P0698 2018 GMC Sierra - 5V Reference 3 Circuit Low Voltage - AutoCodes.com — P0698 2018 GMC Sierra Code - 5V Reference 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0698 2018 GMC Sierra?

Faulty Sensor on 5 Volt circuit
Sensor on 5 Volt circuit harness is open or shorted
Sensor on 5 Volt circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0698 2018 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Disconnecting one component at a time from the affected 5 Volt reference circuit while observing the scan tool 5 Volt Reference Circuit Status parameter may help locate the fault. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5 Volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.

The 5 Volt reference 3 circuit provides 5 Volt to the following sensors: (Some models may have different sensors, please consult the factory service manual for the list of sensors for your model and year)

- Accelerator pedal position sensor 2
- Manifold absolute pressure sensor

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0698 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0698 2018 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0698 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0698 in a 2018 GMC Sierra?

- Common symptoms include issues with the vehicle's electrical system, such as improper voltage readings or erratic behavior of sensors.

2. What does the OBDII code P0698 for a 2018 GMC Sierra indicate?

- The code P0698 points to a problem with the 5V reference 3 circuit, specifically indicating low voltage.

3. What are the possible causes of OBDII code P0698 in a 2018 GMC Sierra?

- Common causes include a faulty 5V reference circuit, damaged wiring or connectors, a malfunctioning sensor, or issues with the powertrain control module (PCM).

4. How can I diagnose the issue related to OBDII code P0698 in a 2018 GMC Sierra?

- Diagnosing the problem typically involves checking the wiring and connectors for damage, testing the sensors for proper functionality, and using a multimeter to measure voltage in the circuit.

5. Is it safe to continue driving a 2018 GMC Sierra with OBDII code P0698?

- It is not recommended to drive the vehicle with this code present, as it can lead to further electrical issues and potential damage to other components.

6. What are some repair tips for fixing OBDII code P0698 in a 2018 GMC Sierra?

- Repair tips may include checking and repairing any damaged wiring, replacing faulty sensors or connectors, and resetting the PCM after addressing the underlying issue.

7. Can a DIY enthusiast fix OBDII code P0698 in a 2018 GMC Sierra?

- While some aspects of diagnosing and repairing this code may be tackled by a DIY enthusiast, professional help may be needed for more complex issues or if the underlying cause is not easily identifiable.

8. How much does it typically cost to repair OBDII code P0698 in a 2018 GMC Sierra?

- Repair costs can vary depending on the exact cause of the issue, but it may range from a simple fix like replacing a sensor to a more involved repair involving the PCM or wiring.

9. Will resetting the OBDII code P0698 in a 2018 GMC Sierra make the problem go away?

- Simply resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to reappear once the problem persists.

10. How can I prevent OBDII code P0698 from occurring in my 2018 GMC Sierra in the future?

- Regular vehicle maintenance, checking for loose connections, and addressing electrical issues promptly can help prevent the recurrence of OBDII code P0698 in the future.